[1] Univ Autonoma Barcelona, Hosp Univ Germans Trias & Pujol, Allergy Unit, Badalona, Spain
[2] Univ Autonoma Barcelona, Hosp Univ Vall dHebron, Dept Internal Med, Allergy Sect, Barcelona, Spain
[3] Univ Autonoma Barcelona, Hosp Univ Vall dHebron, Pediat Allergy & Pulmonol Dept, Pediat Allergy Unit, Barcelona, Spain
[4] Thermo Fisher Sci, Uppsala, Sweden